Mad Music offers a quite comprehensive look at music styles from around the world and their origins. The book is divided into ten rough geographical/cultural segments that the book goes through with a well crafted narrative. Each segment is also peppered with sub-segments about various music genres, musicians, albums, instruments, etc. etc..
Sounds incoherent, but really isn't. Mad Music is a musical map and a travel diary at the same time. Reading it cover to cover can take you on a journey or you can just find information on the music of your next travel destination, which I fully intend to do from now on.
At least half of the enjoyment of this book comes from the Spotify - playlists carefully crafted to accompany each segment. Listening to the corresponding music while reading about it really puts you in the correct mood and doesn't help travel fever one bit. The only problem with the playlists is that they've worked too hard to assemble them and there is enough music for at least double the time it takes to read through each segment!
If I would criticize this book about something, it would be the layout. If you wish to read in full segments you often need to turn the pages back and forth. But it's a small bother in an otherwise great book, that has definitely earned a prime spot in my bookshelf.